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Spray Foam Insulation for the Attic

November 10, 2017

Homeowners considering spray foam insulation in Toronto will be wisely investing in the best insulation product on the market. When it comes to air sealing, moisture control, and energy efficiency, nothing can compare with the performance of spray foam. And in the attic, it’s the ideal option for upgrading or retrofitting the existing insulation.

Retrofitting with spray foam insulation is the most effective way to seal pockets of air leakage while ensuring the very best thermal insulation for both winter and summer weather. More importantly, energy efficiency is maximized, which in turn reduces overall energy consumption and decreases seasonal utility costs for many years to come.  

Today, more and more contractors are recommending spray foam insulation in Toronto as the product-of-choice for the attic and roof. Spray foam is considered to be high performance, with more benefits than other insulation products or combination of products. One on one, no product can compare with the high-performance level of spray foam.

While there is no shortage of insulation products on the market, spray foam offers numerous short-term and long-term benefits. For homeowners thinking about spray foam insulation in Toronto, it’s important to have the work done professionally. The product itself needs special handling, and the application requires previous experience.  

An insulation product that effectively seals & prevents air leakage in your attic

In the attic and roof cavity, spray foam does more with one application than any comparable product. It seals the entire attic space airtight. It provides very high R-Value insulation. And it adds structural strength wherever installed. For homeowners focused on energy efficiency, spray foam provides the highest performance, without compare.

With a professional install, spray foam does more than just insulate. Throughout the attic space, the “envelope” creates a combination air barrier and vapor barrier, preventing any air leakage or moisture accumulation. As a result, the HVAC system (heating + cooling) operates in better balance and with better performance (winter and summer).

Homeowners who have already installed spray foam insulation in Toronto are likely to notice the impact on home energy efficiency almost immediately. Most noticeable is a reduction in utility costs, including winter heating and summer cooling. Long run, the substantial savings, year after year, will serve to “pay down” the original project investment.

Spray foam insulation needs to be handled by professional installers

Probably of most importance with a spray foam installation is to work with a highly experienced professional. By any measure, this is not a weekend DIY project. Spray foam requires expert handling, and the application process requires a certain level of expertise. Trained installers know how to ensure an “insulation blanket” that will perform.

For those installing spray foam insulation in Toronto, it will likely deliver the best return-on-investment when compared with other applications. However, the spray foam product and installation will not suit every project budget. As such, a professional installer will have some valuable advice on a variety of “combination” installations.

In terms of contractors, homeowners would be wise to choose a full-service provider. In this way, warranties are trustworthy and customer satisfaction is guaranteed. A full-service contractor can also ensure follow-up in the event of any issues or problems.

Western Ontario

935 Keyes Drive
Woodstock, Ontario
Canada N4V 1C3

Phone: 1-800-265-1914

Fax: (519) 539-7946
TOLL FREE: 1-800-265-1914

Muskoka, Haliburton, Northern Ontario

1027 Elwell Park Road
Gravenhurst, Ontario
Canada P1P 1R1

TOLL FREE: 1-800-265-1914

Central Ontario

29 Ferndale Industrial Drive
Barrie, Ontario
Canada L4N 9V5

TOLL FREE: 1-800-265-1914

Greater Toronto Area

2 Guided Court
Etobicoke, ON
M9V 4K6

TOLL FREE: 1-800-265-1914

GTA East

103 North Port Road
Port Perry, Ontario
Canada L9L 1B2

TOLL FREE: 1-800-265-1914

South Central Ontario

450 Industrial Dr,
Toronto (Milton), Ontario
Canada L9T 5A6

TOLL FREE: 1-800-265-1914

Eastern Ontario

1035 Moodie Dr #1,
Nepean, ON
K2R 1H4

TOLL FREE: 1-800-265-1914

Niagara Region

25 Lincoln Ave
St. Catharines, ON
L2P 2C7

TOLL FREE: 1-800-265-1914


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Best of 2021

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2021.

Homestars Best of 2022 Award

Best of 2022

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2022.


GNI is the Authorized & Trusted Insulation and Air Sealing Installer for Lowe’s

Trusted for Over 40 Years

Over 40 Years in Business

At GNI, we service your project with the most experienced staff in the industry. Ongoing professional development is an obsession at GNI and we will not compromise at any level to bring to our customers the very best Installers, Sales Representatives, Customer Care Personnel, Field Superintendents, Estimating and Technical Support to your project.

100% Canadian

100% Canadian

Great Northern Insulation is recognized as Canada's largest full-service insulation contractor. GNI is 100% Canadian owned, proudly serving Ontario customers since 1980.

Foam Masters

Do it right the first time
- with foam mastersTM

January, 2021 regulatory phaseout of hydrofluorocarbons (HFCs) with the introduction of WALLTITE CM01. Using hydrofluorolefins (HFOs) with lower global warming potential (GWP) compared to HFCs, WALLTITE CM01 is the next generation of spray foam insulation.



Heatlok® Soya HFOTM leverages Honeywell’s latest Solstice® Liquid Blowing Agent technology. This new hydrofluoroolefin (HFO) blowing agent is the most environmentally conscious blowing agent produced to date, with a zero ozone depletion potential (ODP) and a global warming potential (GWP) of 1, which is more than two orders of magnitude (99.9%) lower than HFCs used in this industry.


3MTM products.
Quality + Performance = Savings

3MTM energy-saving products are designed to keep warm air in, and cold air out, while keeping energy bills down. Products optimize energy efficiency in buildings and homes; improve indoor environment for occupants; and effect the reduction of seasonal energy costs. 3M products are authorized for LEED credits (Leadership in Energy/Environmental Design).

Holmes and Holmes

Holmes and Holmes


Mike Holmes and his son Mike Jr. (MJ) convert MJ’s bachelor bungalow into a two-storey home for MJ and his girlfriend Lisa. Choosing the newest materials and build techniques, the father and son team follow Mike’s famous motto – “Make it right.” The show can be watched on HGTV and DIY Network.


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The Home Efficiency Rebate Plus program offers up to $10,000 in home reno rebates – and Great Northern Insulation can pave the way.


Great Northern Insulation proudly abides by a renovation-specific Code of Conduct set by RenoMark™.


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The GNI crew have been featured installing insulation on Love It or List It - have you seen our logo in an episode?

Climatizer Cellulose


CLIMATIZER PLUS cellulose insulation is manufactured from a minimum of 85% locally-sourced post-consumer recycled newsprint. Non-toxic additives are applied to the uniquely fiberized paper generating a building material with superior thermal and acoustic properties, as well as exceptional resistance to fire, moisture, mould and pests.

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